In a 3-year trial involving 30 ‘d'Anjou’ rootstock-training systems combinations, significant rootstock-training-system-induced differences occurred in all peel mineral elements measured. Variations in nutrient element concentration occurred among years. Significant combination X year interactions occurred in peel N, Mg, Mn, Fe, and Zn. No one rootstock training system combination was consistently either the “highest” or “lowest” for nutrient content for all the elements evaluated.
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Eugene A. Mielke (2004) studied this question.
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